XLSX は Excel の標準ブック形式です。複数シート・数式・グラフ・書式を保持できます。
Typical use: 分析には XLSX、軽い受け渡しには CSV に変換します。
About the XLSX format
XLSX は Excel の標準ブックです。複数シート、数式、グラフ、条件付き書式、ピボットテーブルまで扱え、業務データの中心的な置き場所です。
単なる受け渡しなら CSV のほうが軽く確実です。計算や体裁が必要なデータが XLSX、機械的な取り込みが CSV という使い分けになります。
Strengths
- ✓ 数式・グラフ・複数シート
- ✓ 書式と体裁を保てる
- ✓ 大量行も扱える
Limitations
- ✗ CSV より重い
- ✗ ソフトによって表示差がある
- ✗ Hidden state (sheets, caches) surprises downstream tools
- Structure
- Multiple sheets
- Types / schema
- Typed cells + formulas
- Compatibility
- Excel 2007+, LibreOffice, Sheets
- Best for
- Finance, analysis, models
Tools Actions on XLSX files themselves
Convert XLSX to…
28 direct directions plus 6 workflows, sorted A–Z; 🔥 marks popular targets.
Cross-engine workflows
Convert other files to XLSX…
Frequently asked questions
What is a XLSX file?
XLSX is the modern Microsoft Excel workbook format. It stores multiple sheets with values, styles and charts, and opens in Excel, WPS Office, Numbers and Google Sheets.
How do I convert XLSX files online?
Pick a target format from the "Convert XLSX to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.
Is it safe to convert XLSX files here?
Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.
Which formats can XLSX convert to?
This page lists all 35 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.